Refrigerator

Abstract

The application provides a refrigerator, comprising: a cabinet, which defines a first storage compartment and a second storage compartment; a vapor compression refrigeration system, comprising an evaporator; a Stirling refrigeration system, configured to supply cold to the second storage compartment; and a supply air duct, configured to connect the first storage compartment and the second storage compartment at two ends respectively, so that the airflow after heat exchange in the evaporator can be delivered to the second storage compartment through the supply air duct, thereby achieving the supply of cold to the second storage compartment by the vapor compression refrigeration system. The preservation temperature of the second storage compartment of the refrigerator of the application is widened; the supply of cold to the second storage compartment by the vapor compression refrigeration system is achieved by setting the supply air duct which connects the first storage compartment and the second storage compartment at two ends, and the structure is ingenious and easy to set.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration, in particular to a refrigerator. BACKGROUND

[0002] With the increasing emphasis on health, the amount of high-end food materials stored at home is also increasing. Studies have shown that the properties of food materials will be relatively stable and the shelf life will be greatly extended if the storage temperature of the food materials is lower than the glass transition temperature of the food materials. Among them, the glass transition temperature of food materials is mostly concentrated in the range of-80℃ to-30℃. The existing deep cooling compartment of a household refrigerator using a Stirling refrigeration system is only cooled by the Stirling refrigeration system, resulting in a preservation temperature of the compartment generally in the range of-14℃ to-80℃, which can only be used for freezing food materials. SUMMARY

[0003] An object of the present application is to provide a refrigerator capable of widening the preservation temperature of a second storage compartment.

[0004] A further object of the present application is to provide a refrigerator in which the second storage compartment can be cooled by a Stirling refrigeration system and a vapor compression refrigeration system, and the refrigerator has a clever structure and is easy to set up.

[0005] In particular, the present application provides a refrigerator comprising:

[0006] a cabinet defining a first storage compartment and a second storage compartment inside the cabinet;

[0007] a vapor compression refrigeration system comprising an evaporator, the evaporator being arranged in the first storage compartment;

[0008] a Stirling refrigeration system configured to cool the second storage compartment; and

[0009] an air supply duct configured to connect the first storage compartment and the second storage compartment at two ends, respectively, so that the airflow after heat exchange by the evaporator can be transported into the second storage compartment through the air supply duct, thereby realizing cooling of the second storage compartment by the vapor compression refrigeration system.

[0010] Optionally, the Stirling refrigeration system comprises a Stirling refrigerator and a heat exchanger, the heat exchanger being in thermal connection with the cold end of the Stirling refrigerator; and

[0011] a first air duct cover plate is arranged on the inner side of the liner of the first storage compartment, the first air duct cover plate and the liner of the first storage compartment defining a first containing cavity, and the evaporator is arranged in the first containing cavity;

[0012] a second air duct cover plate is arranged on the inner side of the liner of the second storage compartment, the second air duct cover plate and the liner of the second storage compartment defining a second containing cavity, and the heat exchanger is arranged in the second containing cavity;

[0013] One end of the air supply air duct is communicated with the first accommodating cavity, and the other end is communicated with the second accommodating cavity.

[0014] Optionally, the first storage compartment and the second storage compartment are arranged side by side along the transverse direction.

[0015] The first air duct cover plate and the rear wall of the liner of the first storage compartment define the first accommodating cavity.

[0016] The second air duct cover plate and the rear wall of the liner of the second storage compartment define the second accommodating cavity.

[0017] Optionally, a damper is arranged in the air supply air duct to control the flow of the air flow after heat exchange in the evaporator into the second storage compartment; wherein

[0018] The refrigerator is further configured to:

[0019] When the compartment temperature of the second storage compartment is greater than or equal to the first preset temperature threshold, the damper is opened and the Stirling refrigerator stops running, so as to supply cold to the second storage compartment by using only the vapor compression refrigeration system.

[0020] When the compartment temperature of the second storage compartment is less than the first preset temperature threshold, the damper is closed and the Stirling refrigerator runs, so as to supply cold to the second storage compartment by using only the Stirling refrigeration system.

[0021] Optionally, the refrigerator is further configured to: when the fast freezing mode is running, the damper is opened and the Stirling refrigerator runs, so as to supply cold to the second storage compartment by using the vapor compression refrigeration system and the Stirling refrigeration system at the same time.

[0022] Optionally, the conditions for running the fast freezing mode include:

[0023] Receiving a fast freezing mode start instruction; and / or

[0024] When the target temperature of the second storage compartment is less than or equal to the second preset temperature threshold, and the compartment temperature of the second storage compartment is still greater than the target temperature of the second storage compartment after the preset refrigeration time period.

[0025] Optionally, a first air supply port is formed in the first air duct cover plate, and a first air supply fan is arranged at the first air supply port.

[0026] A second air supply port is formed in the second air duct cover plate, and a second air supply fan is arranged at the second air supply port.

[0027] The refrigerator is further configured to: when the fast freezing mode is running, the duty cycle of the first air supply fan is 100%, and the duty cycle of the second air supply fan is 100%.

[0028] Optionally, when the refrigerator is running in the fast freezing mode, it is further configured to:

[0029] When the target temperature of the second storage compartment is greater than or equal to the first preset temperature threshold, the operating power of the Stirling refrigerator is 50% of the rated power;

[0030] When the target temperature of the second storage compartment is less than the first preset temperature threshold, the operating power of the Stirling refrigerator is 100% of the rated power.

[0031] Optionally, the refrigerator when operating in the quick-freezing mode is further configured to:

[0032] When the target temperature of the second storage compartment is less than the first preset temperature threshold and the compartment temperature of the second storage compartment is greater than the compartment temperature of the first storage compartment, the operating speed of the compressor of the vapor compression refrigeration system is the highest speed until the compartment temperature of the second storage compartment is less than or equal to the compartment temperature of the first storage compartment.

[0033] Optionally, the front side of the second storage compartment is provided with a double-layer door, and the double-layer door comprises an outer door body and an inner door body which are independently arranged.

[0034] The front part of the box body of the second storage compartment is provided with a door frame, one end of the inner door body is connected with the box body, and the other end is connected with the door frame in a separable manner through a mechanical locking mechanism.

[0035] The front end face of the door frame is provided with a clamping groove; the mechanical locking mechanism comprises a first structure, a second structure, a third structure and a rotating rod, a clamping joint is formed on the side end plate of the first structure, and the first structure is rotatably connected with the side end face of the inner door body through the third structure and the rotating rod; the second structure is connected with the door frame and has a protruding portion extending into the clamping groove; the sealing and fixing of the inner door body and the door frame are realized by moving the clamping joint into the clamping groove and adapting with the protruding portion, and the separation of the inner door body and the door frame is realized by moving the clamping joint out of the clamping groove.

[0036] The refrigerator of the present application can supply cold to the second storage compartment through the Stirling refrigeration system and the vapor compression refrigeration system, so that the preservation temperature of the second storage compartment is widened, and the second storage compartment can be used for refrigeration, freezing or ultra-low temperature freezing of food materials; the vapor compression refrigeration system provides cold to the second storage compartment through the air supply duct connected with the first storage compartment and the second storage compartment at two ends, which is ingenious in structure and easy to set up.

[0037] Further, the refrigerator of the present application is provided with a damper in the air supply duct, and is configured to supply cooling to the second storage compartment by the vapor compression refrigeration system alone when the compartment temperature of the second storage compartment is greater than or equal to the first preset temperature threshold, and to switch to supply cooling to the second storage compartment by the Stirling refrigeration system alone when the compartment temperature of the second storage compartment is less than the first preset temperature threshold, thereby not only improving the refrigeration efficiency to the second storage compartment as a whole, but also reducing the energy consumption of the refrigerator and prolonging the service life of the Stirling refrigeration machine.

[0038] The above and other objects, advantages and features of the present application will become more apparent by describing in detail some embodiments thereof with reference to the attached drawings in which: BRIEF DESCRIPTION OF DRAWINGS

[0039] Some specific embodiments of the present application will be described in detail with reference to the attached drawings below. The same reference numbers in different drawings denote the same or similar components or parts. It should be understood by those skilled in the art that the drawings are not necessarily drawn to scale. In the drawings:

[0040] Figure 1 is a perspective view of part of the refrigerator according to one embodiment of the present application.

[0041] Figure 2 is Figure 1 is another perspective view of part of the refrigerator shown in FIG. 1.

[0042] Figure 3 is Figure 1 is a sectional view of part of the refrigerator shown in FIG. 1.

[0043] Figure 4 is another sectional view of part of the refrigerator along line A-A in FIG. 1. Figure 3

[0044] Figure 5 is Figure 1 is a partial exploded view of the double door and the door frame of the refrigerator shown in FIG. 1.

[0045] Figure 6 is Figure 5 is a partial enlarged view of FIG. 1.

[0046] Figure 7 is Figure 1 is a block diagram of the controller of the refrigerator shown in FIG. 1.

[0047] Figure 8 is Figure 1 is a flowchart of the control method of the refrigerator shown in FIG. 1.

[0048] Figure 9 is Figure 1 ​The diagram shows a flow chart of the refrigerator's control method. Detailed Implementation

[0049] In the following description, the directions or positional relationships indicated by "front," "back," "up," "down," "left," and "right" are based on the refrigerator 100 itself as a reference. "Left" and "right" are as follows: Figure 1 The direction indicated.

[0050] Figure 1 This is a three-dimensional schematic diagram of some components of a refrigerator 100 according to an embodiment of the present invention. Figure 2 yes Figure 1 Another perspective view of some components of the refrigerator 100 shown. Figure 3 yes Figure 1 A cross-sectional schematic diagram of some components of the refrigerator 100 shown. Figure 4 It is along Figure 3 Another cross-sectional view of some components of refrigerator 100 on line AA. Figure 5 yes Figure 1 The diagram shows a partial exploded disassembly of the double doors and door frame of the refrigerator 100. Figure 6 yes Figure 5 A magnified view of a portion of the image. Figure 7 yes Figure 1 The block diagram of the controller of the refrigerator 100 shown. Figure 8 yes Figure 1 The flowchart of the control method for the refrigerator 100 shown is illustrated. Figure 9 yes Figure 1 The flowchart of the control method for the refrigerator 100 shown is illustrated.

[0051] The refrigerator 100 of the embodiment of the present application generally comprises a cabinet 101, a vapor compression refrigeration system, a Stirling refrigeration system and an air supply air duct 120. The cabinet 101 defines a first storage compartment 111 and a second storage compartment 112. The vapor compression refrigeration system comprises an evaporator 201, which is arranged in the first storage compartment 111. The Stirling refrigeration system is configured to supply cold to the second storage compartment 112. The air supply air duct 120 is configured to connect the first storage compartment 111 and the second storage compartment 112 at two ends, respectively, so that the airflow after heat exchange by the evaporator 201 can be delivered to the second storage compartment 112 through the air supply air duct 120, thereby realizing the supply of cold to the second storage compartment 112 by the vapor compression refrigeration system. By arranging the air supply air duct 120, the second storage compartment 112 of the refrigerator 100 of the embodiment of the present application can be supplied with cold by one or both of the Stirling refrigeration system and the vapor compression refrigeration system. That is, the second storage compartment 112 of the refrigerator 100 of the embodiment of the present application has three refrigeration modes, the first of which is refrigeration by the Stirling refrigeration system only, the second of which is refrigeration by the vapor compression refrigeration system only, and the third of which is refrigeration by both the Stirling refrigeration system and the vapor compression refrigeration system, which can complement each other. In this way, the preservation temperature range of the second storage compartment 112 can be further widened, so that the preservation temperature of the second storage compartment 112 can vary in a wide temperature range of 4℃ to -80℃, and three functions of refrigeration, freezing and ultra-low temperature freezing can be realized.

[0052] The refrigerator 100 of the embodiment of the present application can supply cold to the second storage compartment 112 by both the Stirling refrigeration system and the vapor compression refrigeration system, so that the preservation temperature of the second storage compartment 112 is widened and the second storage compartment 112 can be used to refrigerate, freeze or ultra-low temperature freeze foodstuffs. The air supply air duct 120 arranged at two ends to connect the first storage compartment 111 and the second storage compartment 112 is used to realize the supply of cold to the second storage compartment 112 by the vapor compression refrigeration system, which is ingenious in structure and easy to arrange. Moreover, since the evaporator 201 of the vapor compression refrigeration system is not arranged in the second storage compartment 112, the problem of refrigerant accumulation in the evaporating pipe of the vapor compression refrigeration system in an ultra-low temperature environment is solved.

[0053] The cabinet 101 can include an outer shell, an inner liner arranged in the outer shell, and a thermal insulation layer arranged between the outer shell and the inner liner. The inner liner defines storage compartments. The first storage compartment 111 can be one or more, and the second storage compartment 112 can be one or more. It can be understood that the first storage compartment 111 and the second storage compartment 112 are relative. In this article, the storage compartment provided with the evaporator 201 and provided with cold energy by the vapor compression refrigeration system alone is referred to as the first storage compartment 111, and the storage compartment not provided with the evaporator 201 but can be provided with cold energy by the vapor compression refrigeration system and the Stirling refrigeration system is referred to as the second storage compartment 112, also referred to as the cryogenic compartment. One or more third storage compartments 113 can also be defined in the cabinet 101, which are defined as storage compartments not provided with the evaporator 201 and provided with cold energy by the vapor compression refrigeration system alone. As shown in Figure 1 The refrigerator 100 is a cross-door refrigerator, in which the second storage compartment 112 is a cryogenic compartment in the lower left upper side, the third storage compartment 113 is a variable-temperature compartment in the lower left lower side, and the first storage compartment 111 is a freezing compartment in the lower right side. The second air supply duct 161 is arranged between the third storage compartment 113 and the first storage compartment 111 to provide cold energy to the third storage compartment 113 by the vapor compression refrigeration system.

[0054] In some embodiments, a damper 123 is arranged in the air supply duct 120 to control the flow of the airflow after heat exchange by the evaporator 201 into the second storage compartment 112. By arranging the damper 123, the on-off control of the refrigeration of the second storage compartment 112 by the vapor compression refrigeration system can be achieved simply and effectively.

[0055] The Stirling refrigeration system includes a Stirling refrigerator 300 and a heat exchanger 305. The Stirling refrigerator 300 is arranged outside the second storage compartment 112 and is in thermal connection with the heat exchanger 305 arranged in the second storage compartment 112, so as to provide cold energy to the second storage compartment 112 by the Stirling refrigeration system. As shown in Figure 3 and Figure 4 In some embodiments, a first air duct cover plate 131 is arranged on the inner side of the inner liner of the first storage compartment 111, and a first containing cavity 141 is defined between the first air duct cover plate 131 and the inner liner of the first storage compartment 111. The evaporator 201 is arranged in the first containing cavity 141. A second air duct cover plate 132 is arranged on the inner side of the inner liner of the second storage compartment 112, and a second containing cavity 142 is defined between the second air duct cover plate 132 and the inner liner of the second storage compartment 112. The heat exchanger 305 is arranged in the second containing cavity 142. One end of the air supply duct 120 communicates with the first containing cavity 141, and the other end communicates with the second containing cavity 142. In Figure 3 , Figure 4The inlet 121 and the outlet 122 of the air supply air duct 120 are shown in FIG. 1. By connecting the two ends of the air supply air duct 120 to the first accommodating cavity 141 and the second accommodating cavity 142 respectively, the cooling supply of the vapor compression refrigeration system and the Stirling refrigeration system to the second storage compartment 112 can share one set of air supply outlet 170, which simplifies the structure and also enables the cold air exchanged by the vapor compression refrigeration system to be pre-mixed with the cold air exchanged by the Stirling refrigeration system before flowing out of the air supply outlet 170 of the second storage compartment 112, so that the temperature of the air flow at the air supply outlet 170 remains basically stable, which is more conducive to the temperature control of the second storage compartment 112 and the storage of goods.

[0056] In some preferred embodiments, the first storage compartment 111 and the second storage compartment 112 are arranged side by side in the transverse direction; the first air duct cover plate 131 and the rear wall of the inner container of the first storage compartment 111 define the first accommodating cavity 141; and the second air duct cover plate 132 and the rear wall of the inner container of the second storage compartment 112 define the second accommodating cavity 142. By arranging the first storage compartment 111 and the second storage compartment 112 side by side and arranging the accommodating cavities close to the rear wall of the inner container, the air supply air duct 120 can be arranged more conveniently, and the length of the air supply air duct 120 can be shortened, thereby shortening the distance of the air supply from the first storage compartment 111 to the second storage compartment 112 and enabling the cold energy to be efficiently transferred to the second storage compartment 112. As shown in FIG. 1, the inlet 121 of the air supply air duct 120 is higher than the side of the outlet 122, so that the air supply air duct 120 is inclined as a whole, which is more conducive to the flow of cold air. Figure 4 As shown in FIG. 1, the inlet 121 of the air supply air duct 120 is higher than the side of the outlet 122, so that the air supply air duct 120 is inclined as a whole, which is more conducive to the flow of cold air. Figure 2 As shown in FIG. 1, the inlet 121 of the air supply air duct 120 is higher than the side of the outlet 122, so that the air supply air duct 120 is inclined as a whole, which is more conducive to the flow of cold air.

[0057] In some embodiments, the first air duct cover plate 131 is provided with a first air supply outlet, and the first air supply outlet is provided with a first air supply fan 151; and the second air duct cover plate 132 is provided with a second air supply outlet, and the second air supply outlet is provided with a second air supply fan 152. The first air supply fan 151 can promote the air flow in the first accommodating cavity 141 to flow outward, and the second air supply fan 152 can promote the air flow in the second accommodating cavity 142 to flow outward.

[0058] The refrigerator 100 of this embodiment further includes: a return air duct 160, configured to connect at both ends to the storage area of ​​the second storage compartment 112 and the first receiving cavity 141, so that the airflow in the storage area of ​​the second storage compartment 112 returns to the first receiving cavity 141 via the return air duct 160. Figures 2 to 4 As shown, a second return air vent 172 is provided on the side wall of the second storage compartment 112 near the first storage compartment 111. One end of the return air duct 160 is connected to the second return air vent 172, and the other end is connected to the first receiving cavity 141. The return air duct 160 is also connected to the return air vent of the third storage compartment 113, so that the airflow in the storage area of ​​the third storage compartment 113 returns to the first receiving cavity 141 through the return air duct 160.

[0059] In some embodiments, the Stirling refrigerator 300 of the present invention includes a housing 301, a cylinder, a piston, and a drive mechanism. The housing 301 includes a main body 311 and a cylindrical portion 312. The piston is configured to reciprocate within the cylindrical portion 312 such that a cold end of the Stirling refrigerator 300 is formed at the end of the cylindrical portion 312, and a hot end of the Stirling refrigerator 300 is formed at the junction of the cylindrical portion 312 and the main body 311. An opening is provided on the side wall of the main body 311, and a cooling fan 313 is provided at the opening. A finned radiator 314 is also provided on the side of the main body 311 where the cylindrical portion 312 is located. Figure 2 As shown, ventilation openings 103 are provided on the left and right sides of the device chamber 102, and a cooling fan 313 is positioned directly opposite the adjacent ventilation opening 103. By opening the side wall of the main body 311 and installing the cooling fan 313, heat dissipation of the main body 311 is facilitated. Positioning the cooling fan 313 directly opposite the adjacent ventilation opening 103 promotes airflow and further improves heat dissipation efficiency. The installation of a finned heat sink 314 at the junction of the main body 311 and the cylindrical part 312 facilitates heat dissipation from the hot end of the Stirling refrigerator 300, while also providing a simple structure and easy assembly. (Continue to refer to...) Figure 2 The Stirling refrigerator 300 is positioned with its cold end facing upwards, which shortens the distance between the Stirling refrigerator 300 and the heat exchanger 305. The Stirling refrigerator 300 can be fixed inside the device chamber 102 by means of springs, shock-absorbing bases, etc.

[0060] The Stirling refrigeration system of this embodiment further includes a cooling device 303, which includes a cold-end adapter 331 and a cooling heat pipe 332. The cold-end adapter 331 is thermally connected to the cold end of the Stirling refrigerator 300, and one end of the cooling heat pipe 332 is thermally connected to the cold-end adapter 331, while the other end is thermally connected to the heat exchanger 305. Furthermore, insulation components 307 may be provided at the cold end of the Stirling refrigerator 300 and the cooling device 303. Figure 3 and Figure 4As shown, the lower part of the cold end adapter 331 wraps around the cold end of the Stirling refrigerator 300. One end of the plurality of cold heat pipes 332 is inserted into the pipe holes of the cold end adapter 331, and the other end is inserted into the heat exchanger 305. With continued reference to Figure 3 and Figure 4 The heat exchanger 305 includes a cold plate 351 and a plurality of spaced apart cold fins 352 extending forward from the front surface of the cold plate 351 to define airflow passages between adjacent cold fins 352. One portion of the other end of the plurality of cold heat pipes 332 is inserted into the cold plate 351, and another portion of the other end of the plurality of cold heat pipes 332 is inserted into one or more cold fins 352. The refrigerator 100 of the present embodiments can achieve large-area heat exchange and improve heat exchange efficiency by configuring the heat exchanger 305 to include the cold plate 351 and the plurality of spaced apart cold fins 352. As shown, Figure 3 The upper part of the second air duct cover plate 132 is provided with an air supply opening 170, and the lower part is provided with a first air return opening 171. The airflow passages of the heat exchanger 305 extend in the vertical direction, and the airflow entering the second containing cavity 142 from the first air return opening 171 passes through the heat exchanger 305 from bottom to top, thereby forming a structure in which the air is returned from the bottom and supplied from the top in the second storage compartment 112.

[0061] As shown, Figure 5 and Figure 6 In some embodiments, a double door 400 is provided on the front side of the second storage compartment 112 of the refrigerator 100 to enhance the heat preservation effect of the refrigerator 100. The double door 400 includes an outer door body 401 and an inner door body 402. The inner door body 402 is located on the inner side of the outer door body 401 and is arranged on the front side of the second storage compartment 112 to open and close the second storage compartment 112. The outer door body 401 and the inner door body 402 are independently arranged to allow the outer door body 401 to be opened outward while the inner door body 402 remains closed. As shown, Figure 1 and Figure 5As shown, when the second storage compartment 112 and the third storage compartment 113 share the same outer door body 401, the double-layer door 400 is arranged to include the outer door body 401 and the inner door body 402 which are independent of each other, and the size of the outer door body 401 is greater than the size of the inner door body 402, and the third storage compartment 113 is opened and closed by the outer door body 401. In this way, when the user takes or places the articles from the third storage compartment 113, the inner door body 402 can remain in a closed state in the state that the outer door body 401 is opened, that is, the second storage compartment 112 is still sealed, and the cold leakage can be effectively reduced. The distance between the inner door body 402 and the outer door body 401 is not greater than 5 mm. If the distance is too large, the risk of frost formation is large. In addition, the outer surface of the inner door body 402 can also be provided with a heating wire, and the heating wire can be intermittently opened or conditionally opened. At the same time, in order to ensure that the outer side of the inner door body 402 does not frost, a vacuum heat insulation board can also be arranged inside the inner door body 402, so that the temperature of the outer surface of the inner door body 402 is greater than 0℃. In order to overcome the problem of negative pressure of the second storage compartment 112, a pressure balance hole can also be arranged on the door seal of the inner door body 402 to ensure that the inner door body 402 can be smoothly opened.

[0062] The refrigerator 100 of the embodiment of the present application further comprises a door frame 430 and a mechanical locking mechanism. The door frame 430 is arranged at the front of the cabinet 101 of the second storage compartment 112. One end of the inner door body 402 is connected with the cabinet 101, and the other end is detachably connected with the door frame 430 through the mechanical locking mechanism. By arranging the independent door frame 430 at the front of the cabinet 101 of the second storage compartment 112, the inner door body 402 can be embedded in the cabinet 101. A sealing strip is arranged between the inner door body 402 and the door frame 430. Specifically, in order to ensure the sealing property of the inner door body 402, a sealing strip is arranged on the matching surface of the inner door body 402 and the door frame 430, and a sealing strip is also arranged on the protruding part of the inner door body 402, that is, a double door seal, which reduces the gap between the inner door body 402 and the door frame 430. At the same time, in order to prevent cold leakage, a sealing strip can also be arranged between the inner door body 402 and the third storage compartment 113. In some embodiments, the inner door body 402 and the cabinet 101 can be connected through at least two hinges 450. By connecting the inner door body 402 and the cabinet 101 through the hinges 450, the angle of the inner door body 402 when being opened can reach 90°. In Figure 5 In the embodiment shown, the inner door body 402 and the cabinet 101 are connected through two hinges 450.

[0063] In some embodiments, the front end surface of the door frame 430 is provided with a clamping groove 431. The mechanical locking mechanism comprises a first structural member 501, a second structural member 502, a third structural member 503 and a rotating rod 504, wherein the side end plate 512 of the first structural member 501 is formed with a clamping joint 5121, and the first structural member 501 is rotatably connected to the side end surface of the inner door body 402 through the third structural member 503 and the rotating rod 504; the second structural member 502 is connected to the door frame 430 and has a protruding portion 521 extending to the clamping groove 431. The sealing and fixing of the inner door body 402 and the door frame 430 are realized by moving the clamping joint 5121 into the clamping groove 431 and adapting it to the protruding portion 521, and the separation of the inner door body 402 and the door frame 430 is realized by moving the clamping joint 5121 out of the clamping groove 431. By providing the clamping groove 431 on the door frame 430, the clamping joint 5121 of the mechanical locking mechanism is used to realize the fixing and separation of the inner door body 402 and the door frame 430, that is, to realize the closing and opening of the inner door body 402, which is a clever structure and is convenient to operate. Figure 6 The first structural member 501 comprises a front end plate 511 and a side end plate 512, and a through hole matching a first rod portion (not shown in the figure) of the rotating rod 504 is formed in the side end plate 512. The third structural member 503 comprises a front end plate and a side end plate, and the side end plate is fixed to the inner door body 402 by means of two mounting holes and a fixing member 530, and a through hole for the rotating rod 504 to pass through is also formed between the two mounting holes and at the position corresponding to the through hole of the first structural member 501, and the through hole of the third structural member 503 matches a second rod portion (not shown in the figure) of the rotating rod 504. Moreover, the outer diameter of the first rod portion of the rotating rod 504 is greater than that of the second rod portion, that is, the outer diameter of the contact area between the rotating rod 504 and the first structural member 501 is greater than that of the contact area between the rotating rod 504 and the third structural member 503, so that the first structural member 501 can be kept connected to the inner door body 402 while being rotatable. In addition, in order to make the installation of the third structural member 503 to the inner door body 402 more stable, a gasket can be arranged below the side end plate of the third structural member 503. Figure 6 In the embodiment shown in the figure, the first structural member 501 rotates in the front-rear direction, the clamping joint 5121 is formed by extending downward and rearward, and the second structural member 502 has a flat plate portion provided with a mounting hole and a protruding portion 521 extending upward from the flat plate portion. It can be understood that the first structural member 501 can also rotate in the up-down direction, in which case the clamping groove 431 can be provided in the left-right direction, and the protruding portion 521 can extend to the left or to the right. In some embodiments, the front end surface of the inner door body 402 is formed with a recessed portion 421; the front end plate 511 of the first structural member 501 extends into the recessed portion 421 and is provided with an indicator 422 on the front side. The part of the front end plate 511 of the first structural member 501 located in the recessed portion 421 can be used as a handle, which is convenient for users to operate, and the setting of the indicator 422 can remind users of the operation direction, thereby improving the user experience.

[0064] The refrigerator 100 of the present application will be described below Figures 7 to 9 The control method of the refrigerator 100 of the present application will be described in detail. As shown in Figure 7 The controller 600 of the refrigerator 100 of the present application can include a processor 601 and a memory 602. The memory 602 stores a computer program 620, which is executed by the processor 601 to implement the control method of the refrigerator 100 of the present application.

[0065] In some embodiments, the refrigerator 100 of the present application is further configured to: when the chamber temperature of the second storage chamber 112 is greater than or equal to the first preset temperature threshold, open the damper 123 and stop the operation of the Stirling refrigerator 300, so as to supply cooling to the second storage chamber 112 by the vapor compression refrigeration system alone; and when the chamber temperature of the second storage chamber 112 is less than the first preset temperature threshold, close the damper 123 and operate the Stirling refrigerator 300, so as to supply cooling to the second storage chamber 112 by the Stirling refrigeration system alone. The refrigerator 100 of the present application is provided with the damper 123 in the air supply duct 120, and is configured to supply cooling to the second storage chamber 112 by the vapor compression refrigeration system alone when the chamber temperature of the second storage chamber 112 is greater than or equal to the first preset temperature threshold, and to switch to supply cooling to the second storage chamber 112 by the Stirling refrigeration system alone when the chamber temperature of the second storage chamber 112 is less than the first preset temperature threshold. The refrigerator 100 of the present application not only improves the overall refrigeration efficiency of the second storage chamber 112, but also reduces the energy consumption of the refrigerator 100 and prolongs the service life of the Stirling refrigerator 300. The first preset temperature threshold can be greater than the minimum refrigeration temperature of the vapor compression refrigeration system. For example, when the minimum refrigeration temperature of the vapor compression refrigeration system is -40℃, the first preset temperature threshold can be -25℃.

[0066] The refrigerator 100 of the present application will be described below Figure 8 The control method of the refrigerator 100 of the present application includes the following steps:

[0067] S102: Obtain the chamber temperature of the second storage chamber 112;

[0068] S104: Determine whether the chamber temperature of the second storage chamber 112 is greater than or equal to the first preset temperature threshold;

[0069] S106: If the determination result of step S104 is yes, control the damper 123 to open and the Stirling refrigerator 300 to stop operating, so as to supply cooling to the second storage chamber 112 by the vapor compression refrigeration system alone;

[0070] S108: If the result of step S104 is no, the damper 123 is closed and the Stirling refrigerator 300 is operated to supply cooling to the second storage compartment 112 by using the Stirling refrigeration system alone.

[0071] The refrigerator 100 of the embodiment of the present application can intermittently acquire the compartment temperatures of the plurality of second storage compartments 112 and respectively perform the judgment of step S104, and select the refrigeration mode according to the latest judgment result after each judgment, so as to realize the matching of the refrigeration system and the compartment temperature and effectively reduce the energy consumption.

[0072] In some embodiments, the refrigerator 100 of the embodiment of the present application is further configured to: when the operation of the quick-freezing mode is satisfied, the damper 123 is opened and the Stirling refrigerator 300 is operated to simultaneously supply cooling to the second storage compartment 112 by using the vapor compression refrigeration system and the Stirling refrigeration system. The refrigerator 100 of the embodiment of the present application can simultaneously supply cooling to the second storage compartment 112 by using the vapor compression refrigeration system and the Stirling refrigeration system when the operation of the quick-freezing mode is satisfied, so as to have high refrigeration efficiency, quickly freeze the food materials in the second storage compartment 112 to the target temperature expected by the user, and improve the user experience.

[0073] The conditions of the operation of the quick-freezing mode include: receiving a quick-freezing mode start instruction; and / or when the target temperature of the second storage compartment 112 is less than or equal to a second preset temperature threshold and the compartment temperature of the second storage compartment 112 is still greater than the target temperature of the second storage compartment 112 after a preset refrigeration time period.

[0074] The user can input the quick-freezing mode start instruction by touching input or voice input, so as to make the refrigerator 100 enter the quick-freezing mode.

[0075] Since the second storage compartment 112 of the refrigerator 100 of the embodiment of the present application can set a wide range of preservation temperature, and the normal refrigeration mode is to supply cooling to the second storage compartment 112 by using the vapor compression refrigeration system alone or by using the Stirling refrigeration system alone, there is a problem of slow cooling speed of the second storage compartment 112. It is possible that the compartment temperature of the second storage compartment 112 is still greater than the target temperature of the second storage compartment 112 after a period of refrigeration. Therefore, the refrigerator 100 of the embodiment of the present application is further configured to: when the target temperature of the second storage compartment 112 is less than or equal to a second preset temperature threshold and the compartment temperature of the second storage compartment 112 is still greater than the target temperature of the second storage compartment 112 after a preset refrigeration time period, forcibly operate the quick-freezing mode, so as to effectively improve the cooling speed of the second storage compartment 112. The target temperature of the second storage compartment 112 can be the preservation temperature input by the user or the appropriate preservation temperature of the currently stored goods by default of the system.

[0076] In particular, when the second storage compartment 112 is cooled by the vapor compression refrigeration system alone, it is determined whether the target temperature of the second storage compartment 112 is less than or equal to a second preset temperature threshold and whether the compartment temperature of the second storage compartment 112 is still greater than the target temperature of the second storage compartment 112 after a preset time period of refrigeration. This is because the cooling speed is more likely to be too slow when the second storage compartment 112 is cooled by the vapor compression refrigeration system alone than when the second storage compartment 112 is cooled by the Stirling refrigeration system alone. Therefore, the forced fast-freezing mode is added to the refrigeration mode in which the second storage compartment 112 is cooled by the vapor compression refrigeration system alone. The second preset temperature threshold is generally greater than the first preset temperature threshold. For example, the first preset temperature threshold can be -25°C and the second preset temperature threshold can be -20°C. The preset time period is preferably a time period during which the second storage compartment 112 is cooled by the current refrigeration mode but not too long, and can be 20 min to 2 h, for example, 20 min, 35 min, 1.5 h, etc.

[0077] Reference Figure 9 The control method of the refrigerator 100 of the embodiment of the present application includes the following steps:

[0078] S202: The refrigerator 100 is in a refrigeration mode in which the second storage compartment 112 is cooled by the vapor compression refrigeration system alone.

[0079] S204: It is determined whether the target temperature of the second storage compartment 112 is less than or equal to a second preset temperature threshold.

[0080] If the determination result of step S204 is no, step S202 is performed, and the refrigerator 100 maintains the current refrigeration mode.

[0081] S206: If the determination result of step S204 is yes, the current refrigeration mode is continued to be performed for a preset time period.

[0082] S208: After step S206 is completed, it is determined whether the compartment temperature of the second storage compartment 112 is greater than the target temperature of the second storage compartment 112.

[0083] If the determination result of step S208 is no, step S202 is performed, and the refrigerator 100 maintains the current refrigeration mode.

[0084] S210: If the determination result of step S208 is yes, a fast-freezing mode is performed, the damper 123 is opened, the Stirling refrigerator 300 is operated, and the second storage compartment 112 is cooled by the vapor compression refrigeration system and the Stirling refrigeration system.

[0085] In addition, the control method of the refrigerator 100 also includes: S212, receiving a quick-freezing mode starting instruction; and then performing step S210.

[0086] For example, assuming that the target temperature of the second storage compartment 112 is -35℃, the first preset temperature threshold is -25℃, the second preset temperature threshold is -20℃, and the preset time period is 1h. Assuming that the initially obtained compartment temperature of the second storage compartment 112 (referred to as the first compartment temperature) is -10℃, since the first compartment temperature -10℃ is greater than the first preset temperature threshold -25℃, the damper 123 is controlled to be opened, the Stirling refrigerator 300 is controlled to stop running, and the vapor compression refrigeration system is used alone to supply cooling to the second storage compartment 112. The target temperature -35℃ of the second storage compartment 112 is less than the second preset temperature threshold -20℃. Assuming that, after 1h of continuous cooling, the again obtained compartment temperature of the second storage compartment 112 (referred to as the second compartment temperature) is -22℃, the second compartment temperature -22℃ is greater than the target temperature -35℃ of the second storage compartment 112, at this time, the quick-freezing mode is forced to run, the damper 123 is controlled to be opened, the Stirling refrigerator 300 is controlled to run, and the vapor compression refrigeration system and the Stirling refrigeration system are used to supply cooling to the second storage compartment 112 until the compartment temperature of the second storage compartment 112 is less than or equal to -35℃.

[0087] In some embodiments, the refrigerator 100 is further configured to: when the quick-freezing mode is running, the duty cycle (i.e., the ratio of the working speed to the rated speed) of the first air supply fan 151 is 100%, and the duty cycle of the second air supply fan 152 is 100%. By controlling the first air supply fan 151 and the second air supply fan 152 to work at a duty cycle of 100%, the overall refrigeration efficiency can be further improved, and the service life of the first air supply fan 151 and the second air supply fan 152 can be prevented from being reduced due to excessive concentration of cold energy.

[0088] In some embodiments, the refrigerator 100 is further configured to: when the target temperature of the second storage compartment 112 is greater than or equal to the first preset temperature threshold, the running power of the Stirling refrigerator 300 is 50% of the rated power; and when the target temperature of the second storage compartment 112 is less than the first preset temperature threshold, the running power of the Stirling refrigerator 300 is 100% of the rated power. By controlling the running power of the Stirling refrigerator 300 in the quick-freezing mode according to different situations, the refrigeration efficiency can be ensured while the energy consumption is reduced as much as possible, and energy is saved.

[0089] In some embodiments, the refrigerator 100 of the embodiments of the present application, when operating in the fast freezing mode, is further configured to: when the target temperature of the second storage compartment 112 is less than the first preset temperature threshold and the compartment temperature of the second storage compartment 112 is greater than the compartment temperature of the first storage compartment 111, the operating speed of the compressor 202 of the vapor compression refrigeration system is the highest speed until the compartment temperature of the second storage compartment 112 is less than or equal to the compartment temperature of the first storage compartment 111. By controlling the compressor 202 to operate at the highest speed when the target temperature of the second storage compartment 112 is less than the first preset temperature threshold and the compartment temperature of the second storage compartment 112 is greater than the compartment temperature of the first storage compartment 111, the overall refrigeration efficiency of the refrigerator 100 can be improved. At the same time, after the compartment temperature of the second storage compartment 112 is less than or equal to the compartment temperature of the first storage compartment 111, the compressor 202 is no longer controlled to maintain the highest speed, which can avoid the problem of reducing the service life of the compressor 202 caused by the high heat dissipation pressure caused by continuously operating at the highest speed.

[0090] At this point, those skilled in the art should recognize that, although the various exemplary embodiments of the present application have been shown and described in detail herein, many other variations and modifications can be made directly to or deduced from the content disclosed herein in accordance with the principles of the present application without departing from the spirit and scope of the present application. Therefore, the scope of the present application should be understood and recognized as covering all such other variations or modifications.

Claims

1. A refrigerator characterized by The refrigerator comprises: a cabinet, which defines a first storage compartment and a second storage compartment inside; a vapor compression refrigeration system, which comprises an evaporator arranged in the first storage compartment; a Stirling refrigeration system, which is configured to supply cooling to the second storage compartment; and an air supply duct, which is configured to be connected to the first storage compartment and the second storage compartment at two ends respectively, so that the air flow after heat exchange in the evaporator can be delivered to the second storage compartment through the air supply duct, thereby achieving the supply of cooling to the second storage compartment by the vapor compression refrigeration system. A damper is arranged in the air supply duct to control the flow of the air flow after heat exchange in the evaporator into the second storage compartment. A double-layer door is arranged on the front side of the second storage compartment, which comprises an outer door body and an inner door body arranged independently of each other, wherein the inner door body is arranged on the front side of the second storage compartment. A door frame is arranged on the front part of the cabinet of the second storage compartment, one end of the inner door body is connected to the cabinet, and the other end is connected to the door frame in a separable manner through a mechanical locking mechanism. A clamping groove is formed on the front end face of the door frame, and the mechanical locking mechanism comprises a first structural member, a second structural member, a third structural member and a rotating rod, a clamping joint is formed on the side end plate of the first structural member, and the first structural member is rotatably connected to the side end face of the inner door body through the third structural member and the rotating rod. The second structural member is connected to the door frame and has a protruding part extending to the clamping groove; the sealing and fixing of the inner door body and the door frame are achieved by moving the clamping joint into the clamping groove and fitting it with the protruding part, and the separation of the inner door body and the door frame is achieved by moving the clamping joint out of the clamping groove.

2. The refrigerator according to claim 1, wherein the Stirling refrigeration system comprises a Stirling refrigerator and a heat exchanger, the heat exchanger is in thermal connection with the cold end of the Stirling refrigerator; and a first air duct cover plate is arranged on the inner side of the liner of the first storage compartment, a first containing cavity is defined between the first air duct cover plate and the liner of the first storage compartment, and the evaporator is arranged in the first containing cavity; a second air duct cover plate is arranged on the inner side of the liner of the second storage compartment, a second containing cavity is defined between the second air duct cover plate and the liner of the second storage compartment, and the heat exchanger is arranged in the second containing cavity; one end of the air supply duct is in communication with the first containing cavity, and the other end is in communication with the second containing cavity.

3. The refrigerator according to claim 2, wherein the first storage compartment and the second storage compartment are arranged side by side along the transverse direction; the first containing cavity is defined between the first air duct cover plate and the rear wall of the liner of the first storage compartment; the second containing cavity is defined between the second air duct cover plate and the rear wall of the liner of the second storage compartment.

4. The refrigerator according to claim 2, wherein the refrigerator is further configured to ​ when the chamber temperature of the second storage chamber is greater than or equal to a first preset temperature threshold, the damper is opened and the Stirling refrigerator is stopped to supply cooling to the second storage chamber by the vapor compression refrigeration system alone; when the chamber temperature of the second storage chamber is less than the first preset temperature threshold, the damper is closed and the Stirling refrigerator is operated to supply cooling to the second storage chamber by the Stirling refrigeration system alone.

5. The refrigerator according to claim 4, characterized in that, The refrigerator is further configured to: when the fast freezing mode is satisfied, the damper is opened and the Stirling refrigerator is operated to supply cooling to the second storage chamber by the vapor compression refrigeration system and the Stirling refrigeration system simultaneously.

6. The refrigerator of claim 5, wherein the condition of the fast freezing mode includes: receiving a fast freezing mode start instruction; and / or when the target temperature of the second storage chamber is less than or equal to a second preset temperature threshold, and the chamber temperature of the second storage chamber is still greater than the target temperature of the second storage chamber after a preset refrigeration time period.

7. The refrigerator of claim 5, wherein a first air supply opening is formed in the first air duct cover plate, and a first air supply fan is arranged at the first air supply opening; a second air supply opening is formed in the second air duct cover plate, and a second air supply fan is arranged at the second air supply opening; the refrigerator is further configured to, when the fast freezing mode is operated, the duty cycle of the first air supply fan is 100%, and the duty cycle of the second air supply fan is 100%.

8. The refrigerator according to claim 5, characterized in that, The refrigerator is further configured to, when the fast freezing mode is operated: when the target temperature of the second storage chamber is greater than or equal to the first preset temperature threshold, the operating power of the Stirling refrigerator is 50% of the rated power; when the target temperature of the second storage chamber is less than the first preset temperature threshold, the operating power of the Stirling refrigerator is 100% of the rated power.

9. The refrigerator according to claim 5, characterized in that, The refrigerator is further configured to, when the fast freezing mode is operated: when the target temperature of the second storage chamber is less than the first preset temperature threshold and the chamber temperature of the second storage chamber is greater than the chamber temperature of the first storage chamber, the operating speed of the compressor of the vapor compression refrigeration system is the highest speed until the chamber temperature of the second storage chamber is less than or equal to the chamber temperature of the first storage chamber.

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